
A total of 41 counties, along with the municipality of Bucharest, constitute the official administrative divisions of Romania. They represent the country's NUTS-3 statistical subdivisions within the European Union and each of them serves as the local level of government within its borders. Most counties are named after a major river, while some are named after notable cities within them, such as the county seat.

There are 42 first-level administrative divisions in Romania that are listed below in order of their total international trade in 2008. The figures in the table are represented for exports and imports. The figures are given in millions of United States dollars. Romania's exports totalled US$ 41.67 billion and imports totalled US$ 66.78 billion in 2008.

Alba County is a county (județ) of Romania located in the historic region of Transylvania. Its capital is Alba Iulia, a city with a population of 63,536.

Arad County is an administrative division (judeţ) of Romania roughly translated into county in the western part of the country on the border with Hungary, mostly in the region of Crișana and few villages in Banat. The administrative center of the county lies in the city of Arad. The Arad County is part of the Danube–Criș–Mureș–Tisa Euroregion.

Argeș County is a county (județ) of Romania, in Muntenia, with the capital city at Pitești.

Bacău County is a county (județ) of Romania, in Western Moldavia, with its capital city at Bacău. It has one commune, Ghimeș-Făget, in Transylvania.
Bihor County is a county (județ) of Romania, in Crișana. Its capital city is Oradea.

Bistrița-Năsăud is a county (județ) of Romania, in Transylvania, with the capital city at Bistrița.

Botoșani County is a county (județ) of Romania, in Western Moldavia, with the capital city at Botoșani.

Brăila County is a county (județ) of Romania, in Muntenia, with the capital city at Brăila.

Brașov County is a county (județ) of Romania, in Transylvania, with the capital city at Brașov. The county incorporates within its boundaries most of the Medieval "lands" (țări) Burzenland and Făgăraș.

Buzău County is a county (județ) of Romania, in the historical region Muntenia, with the capital city at Buzău.

Călărași is a county (județ) of Romania on the border with Bulgaria, in Muntenia, with the county seat at Călărași.

Caraș-Severin is a county (județ) of Romania on the border with Serbia. The majority of its territory lies within the historical region of Banat, with a few northeastern villages considered part of Transylvania. The county seat is Reșița. The Caraș-Severin county is part of the Danube-Kris-Mures-Tisza Euroregion.

Cluj County is a county (județ) of Romania, in Transylvania, with the capital city at Cluj-Napoca.

Constanța is a county (județ) of Romania on the border with Bulgaria, in the Dobruja region. Its capital city is also named Constanța.

Covasna County is a county (județ) of Romania, in Transylvania, with the capital city at Sfântu Gheorghe.

Dâmbovița County is a county (județ) of Romania, in Muntenia, with the capital city at Târgoviște.

Dolj County is a county (județ) of Romania on the border with Bulgaria, in Oltenia, with the capital city at Craiova.

Galați is a county (județ) of Romania, in Moldavia region, with the capital city at Galați.

Giurgiu is a county (judeţ) of Romania on the border with Bulgaria, in Muntenia, with the capital city at Giurgiu.

Gorj County is a county (judeţ) of Romania, in Oltenia, with its capital city at Târgu Jiu.

Harghita is a county (județ) in the center of Romania, in eastern Transylvania, with the county seat at Miercurea Ciuc.

Hunedoara County is a county (județ) of Romania, in Transylvania, with its capital city at Deva. The county is part of the Danube–Criș–Mureș–Tisa Euroregion.

Ialomița County is a county (județ) of Romania, in Muntenia, with the capital city at Slobozia.

Iași County is a county (județ) of Romania, in Western Moldavia, with the administrative seat at Iași. It is the most populous county in Romania, after the Municipality of Bucharest.

Ilfov is the county that surrounds Bucharest, the capital of Romania. It used to be largely rural, but, after the fall of communism, many of the county's villages and communes developed into high-income commuter towns, which act like suburbs or satellites of Bucharest. The gentrification of the county is continuing, with many towns in Ilfov, such as Otopeni, having some of the highest GDP per capita levels in the country.

Maramureș County is a county (județ) of Romania, in the Maramureș region. The county seat is Baia Mare.

Mehedinți County is a county (județ) of Romania on the border with Serbia and Bulgaria. It is mostly located in the historical province of Oltenia, with one municipality (Orșova) and three communes located in the Banat. The county seat is Drobeta-Turnu Severin.

Mureș County is a county (județ) of Romania, in the historical region of Transylvania, with the administrative centre in Târgu Mureș. The county was established in 1968, after the administrative reorganization that re-introduced the historical judeţ (county) system, still used today. This reform eliminated the previous Mureș-Magyar Autonomous Region, which had been created in 1952 within the People's Republic of Romania. Mureș county has a vibrant multicultural fabric that includes Hungarian-speaking Székelys and Transylvanian Saxons, with a rich heritage of fortified churches and towns.

Neamț County is a county (județ) of Romania, in the historic region of Moldavia, with the county seat at Piatra Neamț.

Olt County is a county (județ) of Romania on the border with Bulgaria, in the historical regions of Oltenia and Muntenia. The capital city is Slatina.

Prahova County is a county (județ) of Romania, in the historical region Muntenia, with the capital city at Ploiești.

Sălaj County is a county (județ) of Romania, located in the north-west of the country, in the historical regions of Crișana and Transylvania. It is bordered to the north by Satu Mare and Maramureș counties, to the west and south-west by Bihor County, and to the south-east by Cluj County. Zalău is the county seat as well as its largest city.

Satu Mare County is a county (județ) of Romania, on the border with Hungary and Ukraine. The capital city is Satu Mare. Besides Romanians, Satu Mare features a significant ethnic minority of Hungarians (34.5%).

Sibiu County is a county (județ) of Romania, in the historical region Transylvania, with the capital city Sibiu.

Suceava County is a county (județ) of Romania. Most of its territory lies in the southern portion of the historical region of Bukovina, while the remainder forms part of Western Moldavia proper. The county seat is the historical city of Suceava, formerly the capital of the Principality of Moldavia during the late Middle Ages.

Teleorman County is a county (județ) of Romania on the border with Bulgaria, in the historical region Muntenia, with its capital city at Alexandria.

Timiș is a county (județ) of western Romania on the border with Hungary and Serbia, in the historical region Banat, with the county seat at Timișoara. It is the westernmost and the largest county in Romania in terms of land area. The county is also part of the Danube–Criș–Mureș–Tisa Euroregion.

Tulcea County is a county (județ) of Romania, in the historical region Dobruja, with the capital city at Tulcea.

Vâlcea County is a county (județ) of Romania. Located in the historical regions of Oltenia and Muntenia, it is also part of the wider Wallachia region. Its capital city is Râmnicu Vâlcea.

Vaslui County is a county (județ) of Romania, in the historical region Western Moldavia, with the seat at Vaslui.

Vrancea is a county (județ) in Romania, with its seat at Focșani. It is mostly in the historical region of Moldavia but the southern part, below the Milcov River, is in Muntenia.